package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Category;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Slf4j
@Service
@RequiredArgsConstructor
public class DishServiceImpl implements DishService {

    private final DishMapper dishMapper;
    private final DishFlavorMapper dishFlavorMapper;
    private final SetmealDishMapper setmealDishMapper;
    private final SetmealMapper setmealMapper;

    /**
     * 新增菜品与对应口味
     * @param dishDTO
     */
    @Override
    @Transactional//开启事务管理
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);

        //向菜品插入1条数据
        dishMapper.insert(dish);

        //获取insert生成的主键值id
        long dishId=dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        //判断用户传递的口味数据是否为空
        if (flavors!=null&&flavors.size()>0) {
            //向每个口味设置对应菜品id
            flavors.forEach(dishFlavor ->{
                dishFlavor.setDishId(dishId);
            });
            //向口味表插入多条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        // 遍历每个菜品ID
        ids.forEach(id -> {
            // 获取菜品对象
            Dish dish = dishMapper.getById(id);

            // 判断当前要删除的菜品状态是否为起售中
            if (dish.getStatus() == StatusConstant.ENABLE) {
                // 如果是起售中，抛出业务异常
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        });

        // 判断当前要删除的菜品是否被套餐关联了
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            // 如果关联了套餐，抛出业务异常
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 删除菜品表中的数据和关联的口味表中的数据
//        ids.forEach(id -> {
//            // 删除菜品表中的数据
//            dishMapper.deleteById(id);
//            // 删除口味表中的数据
//            dishFlavorMapper.deleteByDishId(id);
//        });
        //根据菜品id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);
        //根据菜品id集合批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //查询菜品表
        Dish dish = dishMapper.getById(id);
        //查询关联的口味
        List<DishFlavor> dishFlavorList = dishFlavorMapper.getByDishId(id);
        //封装成VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavorList);
        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和对应的口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //1.修改菜品表基本信息
        dishMapper.update(dish);

        //2.删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        //3.重新插入口味数据
        List<DishFlavor> flavors=dishDTO.getFlavors();
        //判断用户传递的口味数据是否为空
        if (flavors!=null&&flavors.size()>0) {
            //向每个口味设置对应菜品id
            flavors.forEach(dishFlavor ->{
                dishFlavor.setDishId(dishDTO.getId());
            });
            //向口味表插入多条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public List<Dish> getByCategoryId(Long categoryId) {
        return dishMapper.getByCategoryId(categoryId);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);


        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    /**
     * 菜品的起售停售
     * @param status
     * @param id
     */
    @Override
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }

}
